A new Pew poll has found that most Americans would support taking military action against Iran:
The public supports tough measures – including the possible use of military force – to prevent Iran from developing nuclear weapons. Nearly six-in-ten (58%) say it is more important to prevent Iran from developing nuclear weapons, even if it means taking military action. Just 30% say it is more important to avoid a military conflict with Iran, even if it means that country develops nuclear weapons. These opinions are little changed from October 2009.
However, the U.S. is not as supportive when it comes to helping Israel should they attack:
About half of Americans (51%) say the United States should remain neutral if Israel takes action to stop Iran’s nuclear program, but far more say the U.S. should support (39%) than oppose (5%) an Israeli attack.